Added e-mail accounts not getting flushed to /etc/passwd

I've added a handful of e-mail users to a few of my customers. I see them in the database, and I've gone in and entered passwords for all of them. When I do "select web_host, web_domain, status from isp_isp_web" I see all of those customers, with a status of 'u'.

When I do "select user_username, status from isp_isp_user where user_username like 'cust_domain.com_%';" I see all of the recently entered e-mail address with a status of 'n'.

The /etc/passwd and /etc/shadow files are never getting updated with entries for these users. Even if I go into an existing mail account in one of these domains and change a mail quota, the disk files are never getting updated.

What am I missing here? Should these changes I've made through the ISPConfig web interface force a disk update to occur?